Cannot return products after upgrade (1.5.3.1 to 1.5.6.2)

[xdios]

Hi everyone!

 

can anyone help me?

 

I have a copy of a prestashop 1.5.3.1 installed in local xampp.

 

I have upgraded it to 1.5.6.2 by using 1-click upgrade module and despite some features/modules were disabled I fixed them, but there is something I have seem that I cannot fix.

 

If I go to "Orders" in backoffice, I cannot return or add an order or product. The buttons don't work and there is no way to return anything. (1)

The button "Add a new discount" doesn't work either.(2)

 

Apart from this, there is an extra button that I had not in previous version called "Modules List" which does nothing.(3)

 

The icons to remove or edit the products are not shown in some orders (4).

 

Any idea?

 

Here is a screenshot with details. 

 

Thanks in advance for helping.